How can I override this function in my child theme's functions.php, so that the arrows display even while using the ascend skin?

//dropdown arrows
class Nectar_Arrow_Walker_Nav_Menu extends Walker_Nav_Menu {
  function display_element($element, &$children_elements, $max_depth, $depth=0, $args, &$output) {
  $id_field = $this->db_fields['id'];
  global $options;
  $theme_skin = (!empty($options['theme-skin']) && $options['theme-skin'] == 'ascend') ? 'ascend' : 'default';

  if (!empty($children_elements[$element->$id_field]) && $element->menu_item_parent == 0 && $theme_skin !='ascend') { 
  $element->title =  $element->title . ''; 
       $element->classes[] = 'sf-with-ul';
  }
     
     if (!empty($children_elements[$element->$id_field]) && $element->menu_item_parent != 0) { 
  $element->title =  $element->title . ''; 
  }
     
  Walker_Nav_Menu::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
  }
}

I know how to edit the function in the parent file, but I dont want to lose the function during furutre updates.

Thank you.